Water is an essential resource, covering basic human needs. The world's
thirst for water is likely to become one of the most pressing resource
issues of the 21st century. Global water consumption rose six fold between
1900 and 1995 more than double the rate of the population growth. Surface
water supplies are Literally shrinking and ground water reserves are being
depleted faster than they can be replenished by precipitation. Water crisis
started gaining momentum and is likely to accelerate further in future.